Particle rotation simply doesn't work.

Tried to give my water particles a random rotation on their birth by adding “random between 2 constants”.
Nothing happened so I returned it to “constant” and changed the value. Nothing happens. Ever. What’s going on?
All the other questions I’ve seen about this (or similar) are years old.

I’ve used particles quite a bit and this has totally caught me off guard.

I’ve seen that behaviour in the Editor, but in game it work correctly.